Advertisements Well, I may have spoken too soon. After the techs left, I've been adjusting my channel list, and now I'm discovering that sometimes the channels are there, and sometimes they're not. I checked my cablecard diagnostics and all seems to be OK. Cable signal strength is 90+. But sometimes the channels are there and sometimes the screen is just black. What gives? I know they tested my signal strength and put in an amplifier just to make sure it was good. I just don't get it. There's no rhyme or reason to this...like I said, sometimes the channels are there and sometimes not. Phooey.